Definitely makes a difference if you have the accompanied breather mods. It's a huge bottleneck if you have big intake/charge pipes, not to mention less work on the turbos. I ended up doing the 240/stanza mod. It was a pain, but worked. I would buy RobZ if I could do it again.

I don't understand why so many car platforms have tons of throttle body options and we have one faulty designed one. Is there no reason someone couldn't make adapter plates to mate with say 240sx TBs? Still would have to grind the plenum, but it would make install reasonably easier.